Yellow fever: a study reconstructs the path of the virus since it returns in Brazil



Since the beginning of 2018, yellow fever has caused panic in Brazil. The virus originated in the summer of 2016 from the depths of the Amazon rainforest and has moved to the south of Brazil, a densely populated area.

In São Paulo, yellow fever (vomito negro) It caused 52 deaths in 134 cases in January 2018 alone, compared with 16 deaths for 53 cases in 2017. The state of São Paulo – the most populous in Brazil – is at the forefront of the virus, like the rest of the south of the country. The same virus, however, lurks before the summer of 2016 in the Amazon rainforest, during which it came out, worn by monkeys and mosquitoes. In two years 676 people died due to yellow fever.

A study published in the journal science On August 23, 2018 and conducted by an international team from the University of Oxford (United Kingdom) and the Oswald-Cruz Institute in Rio (Brazil), the spread of the disease was observed. The yellow fever virus was launched at a speed of 3.3 km per day in the south of Brazil and the megacities of São Paulo and Rio de Janeiro. It is a large location where nearly 35 million non-vaccinated souls live.

The study allowed researchers to reconstruct the course of the virus since it reappeared in July 2016. This is the first time that the rate of spreading of the virus in space and time has been estimated, according to Nuno Faria, professor at the Department of Zoology at the University of Oxford in a statement that describes the study.

Moreover, this research made it possible to understand that the virus was not transmitted by urban mosquitoes Aedes aegypti, but by wild mosquitoes (Haemogogus and Sabethes) who had first put monkeys. So the first infected people probably lived near the habitat of infected monkeys.

The reconstruction of the path of the virus made it possible to understand that the contamination of the apes had preceded that of the men of four days. On the other hand, the propagation speed was higher than the normal speed related to the monkeys. This indicates that the person himself has made a major contribution, mainly due to the illegal trade in monkeys or the transport of infected mosquitoes in vehicles.

Finally, scientists have announced that this research will allow in the future to respond more quickly to possible future outbreaks.

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Yellow fever: a study reconstructs the path of the virus since it returns in Brazil

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